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The Fastest Gun In The Universe is a Keen 3 mod released by KeenRush. As stated by the author, the mod is made in the style of "functional platforming", with the work being limited to the fundamentals of a platform game. It features several new gameplay elements such as Keen having hit points (Vita), so enemies don't necessarily kill him instantly. Instead, the protagonist is invincible for a short moment (Pain Time) when losing Vita. He also has unlimited ammo, but has to recharge his weapon after four shots. The overworld is designed like a platform level rather than a top-down map and Keen is patched to move accordingly in it.